Arduino binary temperature meter

tempduino.pde

#define LEN(x) (sizeof(x)/sizeof(x[0]))
/* connected leds (map temperature between 0°C and  64 °C) */
static int leds[] = {13, 12, 11, 10, 9, 8};

void setup(void)
{
	int i;
	Serial.begin(9600);
	for (i = 0; i < LEN(leds); i++) {
		pinMode(leds[i], OUTPUT);
		digitalWrite(leds[i], 0);
	}
}

void loop(void)
{
	int i, t;

	/* read temperature */
	t = 5.0 * analogRead(0) * 100.0 / 1024.0;

	for (i = 0; i < LEN(leds); i++) {
		if (t & (1 << i))
			digitalWrite(leds[i], 255);
		else
			digitalWrite(leds[i], 0);
	}
	Serial.println(t);
	delay(500);
}